package com.springboot.template.thread.callable;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

public class CallableDemo implements Callable<Integer> {
    @Override
    public Integer call() throws Exception {
        int i = 0;
        for(;i<100;i++)
        {
            System.out.println(Thread.currentThread().getName()+" "+i);
        }
        return i;
    }

    public static void main(String[] args) {
        CallableDemo callableDemo = new CallableDemo();
        FutureTask<Integer> futureTask = new FutureTask<>(callableDemo);
        for (int i = 0; i < 100; i++) {
            System.out.println(Thread.currentThread().getName()+" 的循环变量i的值"+i);
            if (i == 20) {
                new Thread(futureTask, "有返回值的线程").start();
            }
        }
        try {
            System.out.println("子线程的返回值："+futureTask.get());
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        } catch (ExecutionException e) {
            throw new RuntimeException(e);
        }
    }
}
